Cap: 3-10 cm across, convex, later flattening, finally with a central depression, the centre usually with a pointed umbo, red-brown, surface dry and matt, margin somewhat inrolled at first.
Hymenophore: lamellae are pale yellow reddish, thin, when old covered with white spore print.
Spore print: cream
Spore: wide elliptical, 7-8,4(9,5) x 5,5-6,7(7,4) μm, ornament, with solitary warts and ribs which are morely net-like connected.
Stem: 4-8 x 0,5-2 cm, cylindrical, slightly curved, at first whitish, later red-brown, smooth surface, brown when touched, initially full, then hollow, at the bottom with mycelial fibers.
Flesh: firm, fragile, pale red-brown, taste pungent, acrid taste.
Milk: white, very acrid.
Habitat: in large groups on the acid soils under spruces and other conifers, grows from june to october.